What is the principal mediator in allergic rhinitis?

What is the principal mediator in allergic rhinitis?

• A. Cytokine
• B. Lysosomal enzyme
• C. Prostaglandin
• D. Histamine

Answer: (D)

In allergic rhinitis, histamine is the principal mediator responsible for the symptoms associated with the allergic reaction. When an allergen is encountered, it triggers the activation of mast cells, which then release histamine. This compound plays a crucial role in the inflammatory response, leading to common symptoms such as nasal congestion, sneezing, itching, and increased mucus production. The binding of histamine to its receptors on various cells results in the vascular and glandular changes characteristic of allergic responses. Cytokines, while important in the immune response and inflammation, do not directly mediate the symptoms of allergic rhinitis to the same extent as histamine. Lysosomal enzymes do not have a significant role in this specific allergic reaction, as they are more involved in cellular processes such as digestion and defense rather than mediating symptoms. Prostaglandins, while they can be involved in inflammation, are not the principal mediators specifically for allergic rhinitis; instead, they may contribute to the overall inflammatory process. Thus, histamine stands out as the key mediator that drives the symptoms experienced in allergic rhinitis, making it the correct answer.

In allergic rhinitis, histamine is the principal mediator responsible for the symptoms associated with the allergic reaction. When an allergen is encountered, it triggers the activation of mast cells, which then release histamine. This compound plays a crucial role in the inflammatory response, leading to common symptoms such as nasal congestion, sneezing, itching, and increased mucus production. The binding of histamine to its receptors on various cells results in the vascular and glandular changes characteristic of allergic responses.

Cytokines, while important in the immune response and inflammation, do not directly mediate the symptoms of allergic rhinitis to the same extent as histamine. Lysosomal enzymes do not have a significant role in this specific allergic reaction, as they are more involved in cellular processes such as digestion and defense rather than mediating symptoms. Prostaglandins, while they can be involved in inflammation, are not the principal mediators specifically for allergic rhinitis; instead, they may contribute to the overall inflammatory process.

Thus, histamine stands out as the key mediator that drives the symptoms experienced in allergic rhinitis, making it the correct answer.